Application and Effect Evaluation of High Voltage AC Power Supply Systems in Power System Frequency Stability Control

I. Introduction

With the continuous development and increasing complexity of power systems, power system frequency stability has become one of the key factors for the safe operation of power grids. To ensure the stable operation of power systems, the application of high voltage AC power supply systems in frequency stability control is particularly important. This article will discuss from a professional perspective the application of high voltage AC power supply systems in power system frequency stability control and its effect evaluation.

II. The Importance of Power System Frequency Stability

Power system frequency refers to the frequency of AC in the power grid, usually 50Hz or 60Hz. The stability of frequency is crucial for the normal operation of the power system, as it directly affects the speed of generators and motors, power transmission efficiency, and the stability of the power system. When faults occur in the power system or the load changes suddenly, it may lead to frequency deviations, thereby affecting the safe and stable operation of the system.

III. Application of High Voltage AC Power Supply Systems in Frequency Stability Control

1. Automatic Generation Control (AGC): AGC is a technology that maintains power system frequency stability by adjusting generator output. The high-voltage AC power supply system adjusts the output power of the generator in real-time by receiving commands from the dispatch center to eliminate frequency deviations caused by load changes.

2. Primary Frequency Regulation: Primary frequency regulation refers to the automatic adjustment of the governor valve opening of the prime mover by the generator when the power system frequency changes, to quickly respond to frequency changes. The high-voltage AC power supply system plays a key role in primary frequency regulation, which can quickly respond to load changes and reduce frequency fluctuations.

3. Secondary Frequency Regulation: Secondary frequency regulation is based on primary frequency regulation, further eliminating frequency deviations by adjusting the active power distribution of generators. The high-voltage AC power supply system achieves secondary frequency regulation by precisely controlling the output power of generators, improving the frequency stability of the power system.

4. Reactive Power Compensation and Voltage Control: The high-voltage AC power supply system can also improve the operating conditions of the power system through reactive power compensation and voltage control, thereby indirectly improving frequency stability. For example, by investing in reactive power compensation devices, line losses can be reduced, and voltage levels can be improved, which is conducive to frequency stability.

IV. Effect Evaluation

To evaluate the application effect of high-voltage AC power supply systems in power system frequency stability control, the following aspects can be analyzed:

1. Frequency Deviation Indicators: By collecting and analyzing frequency deviation data before and after the application of high-voltage AC power supply systems in power systems, the degree of improvement in system frequency stability can be intuitively understood.

2. System Stability Analysis: Using simulation software to model and simulate the power system, analyze the contribution of high-voltage AC power supply systems to system stability under different load changes and fault conditions.

3. Economic Benefit Evaluation: From an economic perspective, evaluate the economic benefits brought by high-voltage AC power supply systems in improving power system frequency stability, such as reducing equipment damage caused by frequency instability, lowering maintenance costs, etc.

V. Conclusion

In summary, high-voltage AC power supply systems play an important role in power system frequency stability control. Through automatic generation control, primary frequency regulation, secondary frequency regulation, and reactive power compensation and voltage control, high-voltage AC power supply systems can significantly improve the frequency stability of power systems and ensure the safe and reliable operation of power grids. At the same time, scientific evaluation of application effects provides strong support for the optimal dispatching and management of power systems.